Multicore high frequency conductor



@318: F. UNTERBUSCH 'Er AL 2,118,907

. IULTICORE HIGH FREQUENCY CONDUCTOR F lled June 23, 1936 Myarnfgfl 4157- 4 9mm? 7 Pat ysrrm 6 M67741 com? M5741 care-2e Patented May 31, 1938 PATENT OFFICE 2,118,907 mucosa men raa aouascr commo- Frana Unterbusch and Emil Bodemann, Cologne- Mulheim, Germany, assignors to Felten &

Guilleaume Carlswcrk Actien- Gesellschaft,

logne-Mulheim, Germany Application June 23, I In German 3Claims.

This invention relates to an improved high frequency conductor with air space insulation comprising a number of metallic conductors. According to the invention the individual metal conductors are surrounded by a helix of insulating material, preferably polystyrol, the inner diameters of which are substantially larger than the diameter of the metal conductors. The conductors are then stranded together in such a manner that the threads of insulating material interengage in such a manner that the distance between the conductors is equal to the thickness of one thread. By the stranding of the conductors verse section respectively of a second form of construction.

Referring to the construction illustrated in Pigures 1 and 2, the metal conductors I are surround- 30 ed by polystyrol helices 2 and are stranded together in .such a manner that the distance between the two conductors is equal to the thickness of one polystyrol thread. The polystyrol helices maintain the distance between the core 35 and the outer metal covering I.

In order to render more stable the fixing to-- 'gether of the-two conductors l, the latter may be bound together by means of a thread 4 of high tearing resistance and good dielectric prop-1 erties, for instance a thread of polystyrol. In order that the core may have an approximately circular shap polystyrol helices I, which may have a direction opposite to that of the helices 2, are inserted in the free spaces, between the helices I and the metal covering 3, or the said free spaces may contain other fillings.

In order to reduce the damping of such con 4 ductors the helices carrying the conductors may betept at a certain distance from one another,

.fi alsobymeansofdistanceholderaforinstancs further-helices. Suchaformoiconstnactionis illustratedinl'igurels ahd-t.

1936, Serial No. 86,853 y July 2, 1935 The conductors 6," which are in the interior of the helices l, are held at a certain distance from one another and from, the metal covering 9 by means of helices '8. The distance between the conductors is maintained by means of a thread 5 ll of tension resisting .material.

Adjacent helices run preferably in opposite directions or have a different pitch so that they do not fall into one another. The. helices may however be wound round individually, or several to- 10 gether, by means of a thin tape, for instance of polystyrol. Such a tape is indicated in the drawing by H. In this form of construction it has been found advisable to arrange the conductors 6 in such a manner that their distance from the centre of the cable, and from the covering 9, is approximately the same.

What we claim is:-

l. A high frequency cable with. air-space insulation comprising a number of conductors, a helical insulating thread wound round each conductor, the said helical threads having each an inner diameter larger than the conductors they surround and being of such material as to keep their helical shape, additional helices which keep the helices carrying the conductors at a certain distance from one another and means for retalning all the said conductors together as a cable.

2. A high frequency cable with air-space insulation comprising a number of conductors, a hellcal insulating thread wound round each conductor, the said helical threads having each an inner .diameter larger than the conductors they surround and being of such material as to keep their helical shape, additional helices which keep the helices carrying the conductors at a certain distance from one another, and a covering surrounding all the individual conductors with the helices round themand the additional helices together as a cable, the distance of the individual conducy tors from one another being double their distance from the said covering.

8. A high frequency cable as claimed in claim 2, and in which a tension resisting thread of in: sulating material holds the conductors and the 45 additional helices together' at the said distance between the conductors. as compared with their distance from the covering.

m un'rmuacn. w 1. man BOW. 

